Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Troubled Debt Restructuring By Accrual versus Non-Accrual Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 31,659	$ 32,157
Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	18,799	22,066
Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	50,458	54,223
Commercial real estate | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	17,647	17,694
Commercial real estate | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	5,088	5,088
Commercial real estate | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	22,735	22,782
Commercial | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	7,556	7,787
Commercial | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	13,711	16,978
Commercial | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	21,267	24,765
Residential | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	6,456	6,676
Residential | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	0	0
Residential | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 6,456	$ 6,676